[Amim]Cl离子液体中微波辐射加热促进稻草秸秆酸水解制备还原糖

Preparation of reduced sugar via accelerated acid-induced hydrolysis of straw pole in ionic liquid Cl under microwave irradiation

在1-烯丙基-3-甲基咪唑氯盐([Amim]Cl)离子液体介质中,用微波辐射加热促进稻草秸秆纤维素的酸水解,探讨了微波辐射加热及离子液体对酸催化植物纤维素水解的促进作用;并对水解产物中的还原糖进行了测定,着重考察了离子液体用量、硫酸浓度、微波功率、反应温度、反应时间等因素对还原糖收率的影响.结果表明,在[Amim]Cl离子液体介质中,利用微波辐射加热能够显著加快稻草秸秆的酸水解速率,缩短糖化时间,明显提高还原糖的收率;最佳反应条件为:[Amim]Cl用量15.0 mL、10.0%H2SO4用量30.0 mL、稻草秸秆用量25 g/L,微波功率500 W、反应温度85℃、反应时间60 min.在最佳条件下还原糖的收率达24.54%,远高于常规酸水解条件下的还原糖收率(16.25%).

Microwave irradiation was introduced to accelerate the acid-induced hydrolysis of the plant fiber of straw pole in ionic liquid medium of 1-allyl-3-methyl imidazole chloride（Cl）.The accelerating function of microwave irradiation and ionic liquid medium on the acid-induced hydrolysis of the plant fiber was investigated.One of the hydrolysis products,reduced sugar,was determined,with which the effects of dosage of the ionic liquid,concentration of sulfuric acid,microwave power,reaction temperature,and reaction time of the yield of the reduced sugar were examined.Results indicate that,in Cl ionic liquid medium,introducing microwave irradiation helps to significantly accelerate the acid-induced hydrolysis of the straw pole,shorten the time of saccharification,and increase the yield of reduced sugar.The optimized reaction conditions were suggested as Cl dosage of 15.0 mL,10.0% H2SO4 dosage of 30.0 mL,straw pole dosage of 25 g/L,microwave power of 500 W,reaction temperature of 85 ℃,and reaction time of 60 min.The yield of the reduced sugar under the optimized reaction conditions was as much as 24.54%,much higher than that under conventional hydrolysis conditions（16.25%）.